<th width="25"><input type="checkbox"></th>
<th width="">id</th>
<th width="">标题</th>
<th width="">视频标题</th>
<th width="">视频路径</th>
<th width="">视频长度</th>
<th width="">内容标题</th>
<th width="">浏览量</th>
<th width="">等级名称</th>